Malicious PDF — malware analysis report

Static analysis result for SHA-256 468bfdbd776236ad…

MALICIOUS

PDF

76.6 KB Created: 2021-03-21 23:22:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3ae7dd2e86cfe89a073079ba9b0515b5 SHA-1: f7050e73c4e7b024630dccaf2c0345b728673d0b SHA-256: 468bfdbd776236adc7dee61ca11b49733ca7347108b793e3a7748f352f074069
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm designed to lure users to potentially malicious sites. ClamAV and ML heuristics confirm its malicious nature, classifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's used to distribute further malicious content or lead users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://vilenefex.ru/award?keyword=bacteriological+analysis+of+water+pdf PDF link annotation
    • https://cdn.sqhk.co/pepigovagove/7jcNnhj/free_online_slots_no_downloads_or_registrations.pdfIn PDF document text
    • https://cdn.sqhk.co/xaselavub/5BPgfhd/epic_games_launcher_fortnite_download_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418788/normal_6005da1a56e1a.pdfIn PDF document text
    • http://batmbatm.ru/16529840855vevhx.pdfIn PDF document text
    • http://kostlike.site/tovirimizigitupafittnuh1.pdfIn PDF document text
    • http://lightstart.xyz/50633384093wg7zl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499329/normal_6040b4734a045.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449774/normal_604ce3338f199.pdfIn PDF document text
    • https://cdn.sqhk.co/numovasovev/miahcIW/dr_driving_free_download_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tazuxalana/Ejhji8s/drifters_white_christmas_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/narivujuraf/Uja70jg/gogazo.pdfIn PDF document text
    • http://ketotreno.buzz/701651382331rz99.pdfIn PDF document text
    • https://cdn.sqhk.co/vilomikov/fHi8gcY/14853010467.pdfIn PDF document text
    • https://tavebesu.weebly.com/uploads/1/3/1/3/131381332/ec7c4dcdf69a5.pdfIn PDF document text
    • https://dikurowewo.weebly.com/uploads/1/3/4/8/134893632/xopukominaroguriti.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/Ujct2gf/traffic_racer_game_download_for_windows_7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fipijife/buraletejesupodumajepebu.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/set_up_my_cloud_ex2_ultra.pdfIn PDF document text
    • https://s3.amazonaws.com/tuletivotarupu/50283335342.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCA 5564 bytes
SHA-256: c2689e5e249ceac76ab6d2f6d9e1cc260a4b1d677cc9edf9015c94efd8d35ce6
font_01_sfnt_off0000fee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE0 10832 bytes
SHA-256: acff5cc65b3fd6062e8d44139b789983c28e0d735c8c3ba169a53557e89291bc

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